a gunman identified as adam lanza barged into sandy hook elementary school and begin shooting. >> complete chaos. >> teachers rushed to sheppard the yuck children to safety. they were told to close their eyes on the way out. >> we all put our hands on other people's shourdz and teacher led the first person's hand and lead us out. >> one spoke exclusively to diane sawyer. >> i need to know i love you all very much. it's going to be okay because that was the last thing i would have hear. >> all eints the individual i have on the phone continues to believe what he hears is gunfire. >> a small arm swarmed the school but not before the gunman took his toll. >> all afternoon desperate parents converged. some took their children away and others went away with unimaginable grief the victims were remembered at a candlelight vigil in newtown. similar prayer services are going on all over the country with people paying their respects to the fallen what is a true national tragedy. >> dan: tonight we are learning more about him. he was an honor student in high school. he did not appear in his high scho